.\"	$OpenBSD: SSL_get_ex_new_index.3,v 1.4 2018/03/27 17:35:50 schwarze Exp $
.\"	OpenSSL 9b86974e Aug 17 15:21:33 2015 -0400
.\"
.\" This file was written by Lutz Jaenicke <jaenicke@openssl.org>.
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.Dd $Mdocdate: March 27 2018 $
.Dt SSL_GET_EX_NEW_INDEX 3
.Os
.Sh NAME
.Nm SSL_get_ex_new_index ,
.Nm SSL_set_ex_data ,
.Nm SSL_get_ex_data
.Nd internal application specific data functions
.Sh SYNOPSIS
.In openssl/ssl.h
.Ft int
.Fo SSL_get_ex_new_index
.Fa "long argl"
.Fa "void *argp"
.Fa "CRYPTO_EX_new *new_func"
.Fa "CRYPTO_EX_dup *dup_func"
.Fa "CRYPTO_EX_free *free_func"
.Fc
.Ft int
.Fn SSL_set_ex_data "SSL *ssl" "int idx" "void *arg"
.Ft void *
.Fn SSL_get_ex_data "const SSL *ssl" "int idx"
.Bd -literal
typedef int new_func(void *parent, void *ptr, CRYPTO_EX_DATA *ad,
               int idx, long argl, void *argp);
typedef void free_func(void *parent, void *ptr, CRYPTO_EX_DATA *ad,
               int idx, long argl, void *argp);
typedef int dup_func(CRYPTO_EX_DATA *to, CRYPTO_EX_DATA *from, void *from_d,
               int idx, long argl, void *argp);
.Ed
.Sh DESCRIPTION
Several OpenSSL structures can have application specific data attached to them.
These functions are used internally by OpenSSL to manipulate application
specific data attached to a specific structure.
.Pp
.Fn SSL_get_ex_new_index
is used to register a new index for application specific data.
.Pp
.Fn SSL_set_ex_data
is used to store application data at
.Fa arg
for
.Fa idx
into the
.Fa ssl
object.
.Pp
.Fn SSL_get_ex_data
is used to retrieve the information for
.Fa idx
from
.Fa ssl .
.Pp
A detailed description for the
.Fn *_get_ex_new_index
functionality can be found in
.Xr RSA_get_ex_new_index 3 .
The
.Fn *_get_ex_data
and
.Fn *_set_ex_data
functionality is described in
.Xr CRYPTO_set_ex_data 3 .
.Sh EXAMPLES
An example of how to use the functionality is included in the example
.Fn verify_callback
in
.Xr SSL_CTX_set_verify 3 .
.Sh SEE ALSO
.Xr CRYPTO_set_ex_data 3 ,
.Xr RSA_get_ex_new_index 3 ,
.Xr ssl 3 ,
.Xr SSL_CTX_set_verify 3
.Sh HISTORY
Precursor functions
.Fn SSL_set_app_data
and
.Fn SSL_get_app_data
first appeared in SSLeay 0.6.1.
.Pp
.Fn SSL_get_ex_new_index ,
.Fn SSL_set_ex_data ,
and
.Fn SSL_get_ex_data
first appeared in SSLeay 0.9.0 and have been available since
.Ox 2.4 .
